问题
-
1,1/2 , 6/11 ,17/29 , 23/38 ,()A.28/45 B.117/191 C.31/47 D.122/199
-
1/3,4/7 ,7/11 ,2/3 ,13/19 ,()A. 16/21 B. 16/23 C. 18/21 D. 17/21
-
1/4 3/10 () 2/5 A.23/50 B.17/40 C.11/30 D.7/20
-
9,3,10,4,17,11,()A.23B.57C.97 D.122
-
9,3,10,4,17,11,()A.23 B.57 C.97 D.122
-
9,3,10,4,17,11,()A.23 B.57 C.97 D.122